High strength steel plates for hydropower with low susceptibility to welding crack

Grade

600MPa:WDB620(Wuyang standard), SX610CF(China Three Gorges Corp. standard)

800MPa:WSD690(Wuyang standard), SX780CF(China Three Gorges Corp. standard)


Specs

Thickness(8~150)mm, Width(1500~3600)mm, Length(3000~16000)mm


Chemical composition (Melting analysis,%)




Chemical composition*  % (Quality score)



Grade

Thickness


(mm)

C

Si

Mn

P

S

Cr

Ni

Mo

Cu

V

B

600MPa

≤0.40

1

0.15

80

0.07

0.015

0.005

0.5

0.5

0.3

0.05

0.003

>80

1.6




1.5





0.09










≤120











>120

≤0.40

1

0.5

0.1

0.015

0.005

0.6

0.5

0.3

0.05

0.003

150


1.6




1.6





800MPa

0.7

0.5

80

0.09

0.5

0.015

0.005

0.6

0.7

0.5

0.05

0.004

>80


1.5




1.5





0.1











≤120












>120

0.7

0.8

0.11

0.5

0.015

0.005

0.7

0.7

0.5

0.05

0.004

150



1.5




1.8





The supplier may add other elements to improve the plate performance with the content indicated in the quality certificate.

  

Smelting analysis of carbon equivalent(%)and Pcm(%)




  Ceq%

  Pcm%



Grade

Thickness (mm)

600MPa 

≤80

≤0.44

≤0.20

>80~≤120

≤0.46

≤0.23

>120~150

≤0.48

≤0.24

800MPa

≤80

≤0.52

≤0.25

>80~≤120

≤0.54

≤0.26

>120~150

≤0.56

≤0.28

a  Ceq=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14


b  Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B

 

 Mechanical and technological properties  


Grade
Yield strengthTensile strengthElongation b

Impact absorption energy


Impact energy c absorption after 5% strain agingCold-formed


Rp0.2RmAKV2KV2α=1800


MPaMPa%
J
Jb=2a









D=3a
600MPa≤80≥490610~750≥17-20≥100-20≥100No crack on the outer surface
>80~≥470590~730≥17-20≥100-20≥100
≤120
>120≥450570~730≥17-20≥100-20≥100
~150
800MPa≤80≥690770~930≥15-40≥100-20≥100No crack on the outer surface
>80~≤120≥670750~920≥15-40≥100-20≥100
>120≥650740~900≥15-40≥100-20≥100
~150
a  It should be specified in the contract if Buyer shall specify the Z-direction performance which shall comply with the provisions of GB/T 5313.
b A (δ5) represents the elongation at break when LO=5.65SO0.5, where L0 is the original gauge length and S0 is the original cross-sectional area.
c The table shows the impact absorption energy index of the steel plate. The impact absorption energy at the corresponding temperature of the welded joint is 47J. The test result is calculated according to the arithmetic mean of the three samples. One of the sample values is allowed to be lower but not less than 70% of the specified value.

 

600MPa Steel plates for hydropower 


Chemical composition (Melting analysis,%)


Heat No.

C

Si

Mn

P

S

Ni

Cr

Cu

Al

Mo

V

Nb

Ceq

Pcm

Thickness

15407611N3

0.06

0.19

1.55

0.01

0.002

0.23

0.23

0.16

0.031

0.22

0.038

0.017

0.4357

0.19

32-60

15408120N3

0.06

0.19

1.57

0.008

0.002

0.23

0.21

0.16

0.032

0.23

0.041

0.019

0.4378

0.19

32-70

15104022N0

0.07

0.18

1.3

0.008

0.002

0.41

0.34

0.17

0.015

0.29

0.042

0.019

0.4479

0.2

110-115

15104225N0

0.07

0.19

1.31

0.006

0.002

0.42

0.34

0.16

0.024

0.29

0.043

0.017

0.4503

0.2

90-100

15105180N0

0.08

0.15

1.2

0.006

0.001

0.42

0.36

0.21

0.025

0.28

0.045

0.022

0.442

0.2

110


Product analysis of SX610CF Pcm distribution

High strength steel plates  


Product analysis of SX610CF Ceq distribution

High strength steel plates  


Mechanical properties  

Lot No.

Specs

Heat treatment

Yield strength

Strength

Elongation

Direction1

-20℃ impact

Direction2

Impact value 1

Impact value 2

Impact value 3

GZA521708

32





horizontal 

248

263

268

vertical

380

376

359

GZA521708

32

simulated post-weld




horizontal 

270

291

287





GZA521708

32


600

677

21

vertical

299

294

279

horizontal 

343

324

313

GZA521708

32

simulated post-weld

581

662

21.5

vertical

299

297

291





GZHA514311

45





vertical

289

253

297

horizontal 

359

368

363

GZHA514311

45


576

657

20

horizontal 

273

295

299

vertical

359

373

370

GZHA514311

45

simulated post-weld

562

649

21

vertical

238

287

281





GZHA514311

45

simulated post-weld




horizontal 

296

263

299





GZHA514254

60


549

633

21.5

vertical

293

267

246

horizontal 

318

348

325

GZHA514254

60





horizontal 

271

282

299

vertical

335

338

338

GZHA514254

60

simulated post-weld

542

635

24

vertical

251

284

222





GZHA514254

60

simulated post-weld




horizontal 

253

272

249





 

Lot No.

Specs

Heat treatment

Yield strength

Strength

Elongation

Direction

-20℃ impact

Direction
2

Impact value 1

Impact value 2

Impact value 3

GZHA514253

90


555

638

22.5

horizontal 

261

250

267

vertical

316

336

331

GZHA514253

90





vertical

240

279

296

horizontal 

273

236

338

GZHA514253

90

simulated post-weld

542

644

21.5

vertical

295

298

300





GZHA514253

90

simulated post-weld




horizontal 

299

221

237





GZHA513771

110


538

626

21.5

horizontal 

299

287

265

horizontal 

270

279

218

GZHA513771

110





vertical

269

245

260

vertical

241

298

297

GZHA513771

110

simulated post-weld

561

644

19.5

horizontal 

245

250

264





GZHA513771

110

simulated post-weld




vertical

271

258

289





GZHA513773

110


504

617

21

horizontal 

263

291

292

horizontal 

245

277

272

GZHA513773

110





vertical

299

299

293

vertical

300

287

275

GZHA513773

110

simulated post-weld

547

647

19.5

horizontal 

247

276

255





GZHA513773

110

simulated post-weld




vertical

268

268

271





 

 

700MPa Steel plates for hydropower 


Chemical composition (Melting analysis,%)


Heat No.

C

Si

Mn

P

S

Ni

Cr

Cu

Al

Ti

Mo

V

Nb

B

Ceq

Pcm

15408309N3

0.07

0.18

1.11

0.005

0.003

0.58

0.53

0.23

0.037

0.011

0.44

0.033

0.012

0.0009

0.4954

0.216

15408310N3

0.07

0.19

1.13

0.003

0.002

0.57

0.52

0.24

0.04

0.007

0.45

0.035

0.012

0.001

0.4995

0.219

15408311N3

0.07

0.17

1.16

0.005

0.003

0.59

0.52

0.25

0.04

0.012

0.44

0.031

0.009

0.0008

0.5014

0.218

15408312N3

0.07

0.19

1.13

0.003

0.001

0.58

0.52

0.26

0.022

0.006

0.43

0.031

0.01

0.0008

0.4945

0.217

15408660N3

0.07

0.19

1.14

0.01

0.002

0.55

0.54

0.23

0.041

0.012

0.43

0.031

0.01

0.001

0.4994

0.218

15408661N3

0.07

0.17

1.13

0.007

0.002

0.55

0.55

0.22

0.036

0.008

0.43

0.031

0.011

0.0008

0.4989

0.216

15408662N3

0.07

0.19

1.15

0.007

0.002

0.56

0.55

0.23

0.048

0.01

0.43

0.03

0.011

0.001

0.5032

0.219

15408733N3

0.07

0.14

1.15

0.006

0.003

0.57

0.54

0.22

0.035

0.006

0.43

0.032

0.01

0.0014

0.4995

0.219

15409496N3

0.08

0.16

1.17

0.007

0.003

0.56

0.54

0.21

0.029

0.005

0.45

0.032

0.01

0.001

0.5185

0.229

15409497N3

0.07

0.16

1.16

0.008

0.004

0.58

0.55

0.21

0.031

0.005

0.44

0.031

0.01

0.001

0.5067

0.218

15409742N3

0.07

0.13

1.15

0.008

0.002

0.57

0.56

0.22

0.03

0.004

0.44

0.034

0.011

0.0008

0.5058

0.217

15409743N3

0.07

0.13

1.14

0.008

0.002

0.57

0.56

0.22

0.032

0.004

0.44

0.034

0.011

0.0008

0.5041

0.217

15409744N3

0.07

0.17

1.16

0.006

0.003

0.56

0.54

0.21

0.033

0.004

0.45

0.031

0.011

0.001

0.5071

0.219

15409886N3

0.08

0.12

1.15

0.004

0.002

0.56

0.55

0.21

0.031

0.006

0.43

0.035

0.01

0.001

0.5107

0.226

 

 Product analysis of SX780CF Pcm distribution

High strength steel plates for hydropower with low susceptibility to welding crack

 

 Product analysis of SX780CF Ceq distribution

High strength steel plates for hydropower with low susceptibility to welding crack

Mechanical properties

 

Heat No.SpecsYield strengthStrengthElongationImpactImpact value 1Impact value 2Impact value 3ImpactImpact value 1Impact value 2Impact value 3
15408310N35679483617-40℃232211252-20℃306295314
15408311N35679784218-40℃256190241-20℃258301249
15408312N35677482518-40℃216239237-20℃175243235
15408660N36080184020-40℃258200227-20℃273269288
15408662N36076382118.5-40℃261260258-20℃198253278
15408663N36078884719-40℃211199208-20℃254268259
15408698N36077682118-40℃284253274-20℃210210173
15408700N36078483718-40℃252283259-20℃261268251
15408733N36077582117.5-40℃237268248-20℃305366308
15408736N36079383518-40℃165176190-20℃260266270
15409305N35677081617-40℃206211196-20℃288304261
15409306N35676782519-40℃240271250-20℃346301330
15409307N35678083219.5-40℃200204241-20℃304269331
15409496N36074781718-40℃236235260-20℃271331249
15409497N36075181720-40℃164168175-20℃195218245
15409743N36077883617.5-40℃282300284-20℃291193229
15409744N35676583219.5-40℃260299153-20℃258346318
15409886N35676782719-40℃190152199-20℃230285314


Bending performance

To verify the cold bending formability of WSD690E plate, cold bending tests are carried out respectively on 60mm, 85mm and 100mm plates with four diameters of bending centers d=1.5a, d=2.0a, d=2.5a and d=3.0a.

 

The test results show that the surfaces of 60mm, 85mm and 100mm plates after cold bending are good. Thus, WSD690E plate has good cold bending formability.



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